1 // SPDX-License-Identifier: GPL-2.0
3  * Fan Control HDL CORE driver
9 #include <linux/fpga/adi-axi-common.h>
33 #define ADI_IRQ_SRC_TACH_ERR		BIT(1)
56 	iowrite32(val, ctl->base + reg);  in axi_iowrite()
62 	return ioread32(ctl->base + reg);  in axi_ioread()
105 	return DIV_ROUND_CLOSEST(60 * ctl->clk_rate, ctl->ppr * tach);  in axi_fan_control_get_fan_rpm()
118 		 *      T = (ADC * 501.3743 / 2^bits) - 273.6777  in axi_fan_control_read_temp()
122 		*val = ((raw_temp * 501374) >> 16) - 273677;  in axi_fan_control_read_temp()
125 		return -ENOTSUPP;  in axi_fan_control_read_temp()
135 		*val = ctl->fan_fault;  in axi_fan_control_read_fan()
137 		ctl->fan_fault = 0;  in axi_fan_control_read_fan()
143 		return -ENOTSUPP;  in axi_fan_control_read_fan()
156 		return -ENOTSUPP;  in axi_fan_control_read_pwm()
168 		return -ENOTSUPP;  in axi_fan_control_write_pwm()
178 		*str = "FAN";  in axi_fan_control_read_labels()
184 		return -ENOTSUPP;  in axi_fan_control_read_labels()
200 		return -ENOTSUPP;  in axi_fan_control_read()
212 		return -ENOTSUPP;  in axi_fan_control_write()
275  * on which the core waits for the fan rotation speed to stabilize. After this
278  * already to the ney duty cycle) based on the %ctl->hw_pwm_req flag.
287 		if (ctl->update_tacho_params) {  in axi_fan_control_irq_handler()
295 			ctl->update_tacho_params = false;  in axi_fan_control_irq_handler()
305 		if (!ctl->hw_pwm_req) {  in axi_fan_control_irq_handler()
306 			ctl->update_tacho_params = true;  in axi_fan_control_irq_handler()
308 			ctl->hw_pwm_req = false;  in axi_fan_control_irq_handler()
309 			sysfs_notify(&ctl->hdev->kobj, NULL, "pwm1");  in axi_fan_control_irq_handler()
315 		ctl->hw_pwm_req = true;  in axi_fan_control_irq_handler()
318 		ctl->fan_fault = 1;  in axi_fan_control_irq_handler()
332 	/* get fan pulses per revolution */  in axi_fan_control_init()
333 	ret = of_property_read_u32(np, "pulses-per-revolution", &ctl->ppr);  in axi_fan_control_init()
337 	/* 1, 2 and 4 are the typical and accepted values */  in axi_fan_control_init()
338 	if (ctl->ppr != 1 && ctl->ppr != 2 && ctl->ppr != 4)  in axi_fan_control_init()
339 		return -EINVAL;  in axi_fan_control_init()
356 	HWMON_CHANNEL_INFO(fan, HWMON_F_INPUT | HWMON_F_FAULT | HWMON_F_LABEL),
373 static const u32 version_1_0_0 = ADI_AXI_PCORE_VER(1, 0, 'a');
376 	{ .compatible = "adi,axi-fan-control-1.00.a",
391 	id = of_match_node(axi_fan_control_of_match, pdev->dev.of_node);  in axi_fan_control_probe()
393 		return -EINVAL;  in axi_fan_control_probe()
395 	ctl = devm_kzalloc(&pdev->dev, sizeof(*ctl), GFP_KERNEL);  in axi_fan_control_probe()
397 		return -ENOMEM;  in axi_fan_control_probe()
399 	ctl->base = devm_platform_ioremap_resource(pdev, 0);  in axi_fan_control_probe()
400 	if (IS_ERR(ctl->base))  in axi_fan_control_probe()
401 		return PTR_ERR(ctl->base);  in axi_fan_control_probe()
403 	clk = devm_clk_get(&pdev->dev, NULL);  in axi_fan_control_probe()
405 		dev_err(&pdev->dev, "clk_get failed with %ld\n", PTR_ERR(clk));  in axi_fan_control_probe()
409 	ctl->clk_rate = clk_get_rate(clk);  in axi_fan_control_probe()
410 	if (!ctl->clk_rate)  in axi_fan_control_probe()
411 		return -EINVAL;  in axi_fan_control_probe()
415 	    ADI_AXI_PCORE_VER_MAJOR((*(u32 *)id->data))) {  in axi_fan_control_probe()
416 		dev_err(&pdev->dev, "Major version mismatch. Expected %d.%.2d.%c, Reported %d.%.2d.%c\n",  in axi_fan_control_probe()
417 			ADI_AXI_PCORE_VER_MAJOR((*(u32 *)id->data)),  in axi_fan_control_probe()
418 			ADI_AXI_PCORE_VER_MINOR((*(u32 *)id->data)),  in axi_fan_control_probe()
419 			ADI_AXI_PCORE_VER_PATCH((*(u32 *)id->data)),  in axi_fan_control_probe()
423 		return -ENODEV;  in axi_fan_control_probe()
426 	ctl->irq = platform_get_irq(pdev, 0);  in axi_fan_control_probe()
427 	if (ctl->irq < 0)  in axi_fan_control_probe()
428 		return ctl->irq;  in axi_fan_control_probe()
430 	ret = devm_request_threaded_irq(&pdev->dev, ctl->irq, NULL,  in axi_fan_control_probe()
433 					pdev->driver_override, ctl);  in axi_fan_control_probe()
435 		dev_err(&pdev->dev, "failed to request an irq, %d", ret);  in axi_fan_control_probe()
439 	ret = axi_fan_control_init(ctl, pdev->dev.of_node);  in axi_fan_control_probe()
441 		dev_err(&pdev->dev, "Failed to initialize device\n");  in axi_fan_control_probe()
445 	ctl->hdev = devm_hwmon_device_register_with_info(&pdev->dev,  in axi_fan_control_probe()
451 	return PTR_ERR_OR_ZERO(ctl->hdev);  in axi_fan_control_probe()
464 MODULE_DESCRIPTION("Analog Devices Fan Control HDL CORE driver");